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Part 4 Trouble Shooting
EEV Check
Failure mode
Diagnosis Repair process
Microcomputer
Driving circuit
failure
1.Disconnect the EEV connector form control board and
connect testing LED
2. Main power ON, pulse signal is out from EEV for 17 sec.
If LEDs do not turn on, or are in on state continuously,
then driving circuit is abnormal
Check and replace outdoor unit
control board
EEV locking 1.If EEV is locked, in no load state, the driving motor rotate,
and clicking sound always occurs
Replace EEV
EEV Motor coil
short or
misconnection
1. Check the resistance between coil terminal
(red-white, red-yellow, red-orange, red-blue)
2. If the estimated resistance value is in 52±3Ω
then the EEV is normal
Replace EEV
1K LED
6.6 Troubleshooting Outdoor Error
CH 21 (DC Peak / Comp IGBTM Fault)
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